Mind-body exercise tops the list for ageing brains

Cognitive decline is one of the most feared aspects of ageing, and there is no pill that reliably prevents it. That puts the spotlight on nonpharmacological options — everything from exercise and meditation to cognitive training and brain stimulation — as ways to maintain current function and build cognitive reserve. But with so many candidate approaches, the practical question is which one deserves an older adult's limited time. A network meta-analysis is designed to answer exactly that, ranking multiple interventions against each other even when they have never been tested head to head.

The researchers pooled 61 randomised controlled trials that evaluated the effect of nonpharmacological interventions on global cognition in older adults, both with and without mild cognitive decline. Seven categories of intervention were compared: mind-body exercise, physical exercise, non-invasive brain stimulation, cognitive training, acutherapy, meditation and music therapy. Using network meta-analysis, they estimated each intervention's effect on global cognition relative to passive control conditions, expressed as standardised mean differences with 95% confidence intervals.

Six of the seven approaches outperformed passive controls: mind-body exercise showed the largest standardised mean difference at 1.384 (95% CI 0.777–1.992), followed by acutherapy at 1.283, cognitive training at 1.269, non-invasive brain stimulation at 1.242, physical exercise at 0.977 and meditation at 0.910. Music therapy was not among the interventions reported as showing a significant benefit. Importantly, there were no significant differences between the active interventions themselves, so the analysis could not crown a definitive winner.

This analysis supports the broad view that structured, drug-free activity — physical, mental or both — is associated with better global cognition in later life, and it extends the evidence by ranking seven approaches within a single framework. The authors suggest several plausible pathways, including memorising movements and enhancing brain plasticity by reducing stress. What it cannot settle is why effects differ, since intervention methods and psychological variables varied across trials, and the overlapping confidence intervals leave the ordering of interventions uncertain. Further studies are needed to clarify those moderating factors.

For anyone thinking about protecting cognition with age, this is a reason to believe the menu of useful options is wide rather than narrow. Practices that combine movement with mental engagement — the mind-body category — came out at the top of this ranking, but conventional exercise, cognitive training and meditation all beat doing nothing. Since no approach significantly outperformed another, the evidence here is compatible with choosing whichever activity someone will actually sustain. It is informational support for staying active in body and mind, not a prescription for any single method.